HEATH (plagiarism/outsource) by Tan Lin is book "set" in plain text, composed of a mash up of data sources from RSS feeds, blog posts, Google searches, retrieved photographs, handwritten notes, and items of that nature. It is divided into multiple parts, the most famous of which being plagiarism/outsource. Lin devotes part of the book to a series of web searches regarding the death of actor Heath Ledger in 2008 in Untilted Health Ledger Project, which is assumed to be the reason for the name of the whole book.

A heath or heathland is a shrubland habitat found mainly on free-draining infertile, acidic soils and is characterised by open, low-growing woody vegetation. Moorland is generally related to high-ground heaths with — especially in the British Isles — a cooler and more damp climate.